EP3237848A1 - Débitmètre électromagnétique - Google Patents

Débitmètre électromagnétique

Info

Publication number
EP3237848A1
EP3237848A1 EP15804146.7A EP15804146A EP3237848A1 EP 3237848 A1 EP3237848 A1 EP 3237848A1 EP 15804146 A EP15804146 A EP 15804146A EP 3237848 A1 EP3237848 A1 EP 3237848A1
Authority
EP
European Patent Office
Prior art keywords
magnetic
measuring tube
measuring
cross
tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP15804146.7A
Other languages
German (de)
English (en)
Other versions
EP3237848B1 (fr
Inventor
Stefan RUPP
Thomas Sulzer
Wolfgang Brobeil
Oliver Popp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Endress and Hauser Flowtec AG
Original Assignee
Endress and Hauser Flowtec AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Endress and Hauser Flowtec AG filed Critical Endress and Hauser Flowtec AG
Publication of EP3237848A1 publication Critical patent/EP3237848A1/fr
Application granted granted Critical
Publication of EP3237848B1 publication Critical patent/EP3237848B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
    • G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
    • G01F1/588—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters combined constructions of electrodes, coils or magnetic circuits, accessories therefor

Definitions

  • the present invention relates to a magnetic-inductive flowmeter.
  • Flowmeters are differentiated according to different criteria.
  • the most widespread differentiation criterion is the differentiation according to measurement principles. Accordingly, e.g. Coriolis Flowmeters, Ultrasonic Flowmeters, Thermal Flowmeters, Vortex Flowmeters, Electromagnetic Flowmeters, SAW (Surface Acoustic Wave) Flowmeters, V-Cone Flowmeters, and
  • Float flowmeters known. Corresponding flowmeters are available in part from the Applicant or other suppliers. In the present case, it is specifically about a magnetic-inductive flowmeter. Another distinguishing feature is whether the flowmeter has a measuring tube or whether the flowmeter can be mounted or mounted on a conventional pipeline or process line, without the medium flow within the pipeline during installation of the flowmeter to
  • Typical ultrasonic measuring devices of the type described above are so-called clamp-on ultrasonic flowmeters.
  • Flowmeters with flow tubes are known as inline flowmeters.
  • plastic pipes for example made of polyethylene or polyamide, known, which can be used as measuring tubes in magnetic-inductive measuring tubes.
  • the use of these plastic pipes is limited, since these pipes expand or contract when the medium pressure changes. Due to the change in the diameter of a measuring tube, a measurement error occurs. With a measuring tube with a reduced cross-section, the expansion tendencies in the area of the reduced cross-section would even increase.
  • the present invention solves this problem by a magnetic-inductive
  • Electrically inductive flowmeter comprising a measuring tube to which a magnet system and a plurality of measuring electrodes are arranged or fixed.
  • the measuring electrodes at which an induced voltage is tapped off, diametrically opposite to the measuring tube.
  • additional measuring electrodes may be arranged circumferentially distributed on the measuring tube or incompletely filled
  • Measuring tubes rather in the lower part of the measuring tube. It is also possible for a plurality of measuring electrodes to be arranged in pairs one behind the other. In the course of
  • a magnet comprises in the most common construction two diametrically opposite field coils whose connection axis perpendicular to the measuring tube axis and the
  • Measuring electrode axis is arranged.
  • a magnetic-inductive flowmeter comprises a measuring tube on which a magnet system and at least two or more Measuring electrodes are arranged and / or fixed. Measuring electrodes are usually pin-shaped and connected directly or indirectly to the measuring tube wall. But there are also known in the measuring tube potted metal segments, which as
  • Measuring electrodes serve or ring electrodes.
  • the measuring tube has an inlet and outlet area with a first cross section.
  • the measuring tube is connected to a process line in these areas.
  • the inlet and outlet area has in most cases a circular cross-section. However, even in rare cases, they are polygonal, e.g. rectangular or triangular, process lines known and corresponding to the off and
  • the measuring tube according to the invention has a middle segment between the inlet and outlet regions, which has a second cross section.
  • This middle segment serves for flow conditioning and may be a reduction in even
  • the measuring electrodes are arranged in the middle segment of the measuring tube.
  • the middle segment is encompassed, at least in the region of the measuring electrodes, by a tube holder which counteracts a cross-sectional deformation of the second cross section.
  • the tube holder encloses or in its entirety surrounds the measuring tube in the middle segment preferably in its entirety. However, I do not have to extend the tube support over the entire width of the middle segment, relative to the longitudinal axis of the measuring tube. Since it is primarily about preventing the change in the length of the measuring electrode distance, but the pipe support should be located at least in the region of the measuring electrodes and support the measuring tube in this area. This aforementioned range preferably starts no more than 2 cm, preferably less than 1 cm away from the measuring electrodes.
  • the magnet system is arranged and / or fixed on or on the tube holder. This allows a compact design can be realized. If the pipe holder is made of magnetically conductive metal, a pole piece can be omitted since the pipe holder can take over the functionality of the pole piece.
  • the middle segment has at least two opposing planar surfaces which are intended as bearing surfaces for the magnet system. This ensures easy mounting of the magnet system.
  • the pipe holder may consist of at least two flat plates, which are interconnected.
  • the plates may in particular consist of metal.
  • the plates can project beyond the flat surfaces at least in some areas. At these projecting locations fastening means, e.g. Bolts are attached. A particularly high strength of the pipe holder results if the flat plates are connected by bolts.
  • the tube holder fully encloses the middle segment. It is particularly advantageous if the measuring tube is a plastic measuring tube. On the one hand, the geometry of the cross-sectional constriction in the middle segment can already be taken into account during the shaping of the tube and, on the other hand, the tube holder is used particularly advantageously because straight plastic tubes are pressure-induced
  • the Corresponding plastic materials from which the measuring tube may consist are preferably polyethylene, polyamide, polypropylene and / or polyvinyl chloride.
  • each of the plates has a thickness which corresponds at least to the wall thickness of the measuring tube. It is advantageous if between the magnet system and the measuring tube only, so exclusively, the flat plates are arranged. For example, field plates can be omitted.
  • the central segment can be particularly advantageous in a minimum diameter d m and a maximum cross section d ma have x, where d m is smaller in at least 20%, preferably 50% less, at least when d ma x
  • Fig. 1 perspective view of a measuring tube of a magnetic-inductive
  • FIG. 2 front view of a measuring tube of a magnetic-inductive
  • Fig. 3 side sectional view along the longitudinal axis of the measuring tube;
  • Fig. 4 is a schematic sectional view of a magnetic-inductive flowmeter according to the invention.
  • Fig. 5 is a schematic detail view of the flowmeter according to the invention
  • the structure and the measuring principle of a magnetic-inductive flowmeter are basically known. According to Faraday's law of induction, a voltage is induced in a conductor moving in a magnetic field. At the
  • the flowing medium corresponds to the moving conductor.
  • a magnetic field of constant strength is generated by a magnet system.
  • This may preferably be two field coils which are arranged diametrically opposite one another at the same height of the measuring tube axis A of a measuring tube on the measuring tube. Perpendicular to this are located on the tube inner wall of the measuring tube, two or more measuring electrodes, which tap the voltage generated when flowing through the medium.
  • the induced voltage is proportional to the flow velocity and thus to the volume flow. That by the Magnetic field magnetic field is generated by a clocked DC alternating polarity. This ensures a stable zero point and makes the measurement insensitive to influences by multiphase substances,
  • Magnetic-inductive flowmeters having coil arrangements with more than two field coils and other geometrical arrangements are known.
  • the Applicant has been providing magnetic-inductive flowmeters for several decades
  • the flowmeter described above is one of the most common structures.
  • magnetic-inductive flowmeters with more than two field coils and more than two measuring electrodes are known.
  • 4 shows a magnetic-inductive flow meter 1 with a plastic tube 2, which has a measuring tube axis A.
  • the plastic raw r may be formed from a material customary for pipe construction. In particular, polyethylene or polyamide compounds come into consideration.
  • the support tube 3 has terminal flanges 6, which each have at least one connection surface. This connection surface is for connection to a
  • the magnetic-inductive flowmeter also has a measuring tube 2, which is shown in greater detail in FIGS.
  • the measuring tube 2 has in its inlet and outlet region 1 1 and 12 preferably a circular cross-section. This cross section changes over the course of the measuring tube. 2
  • the tube has a central segment 10, in which a minimum
  • Pipe diameter at least 20%, preferably by 50% less than the pipe diameter in the inlet region 1 1 or outlet area 12.
  • Pipe diameter is compared to the minimum pipe diameter at least 20%, preferably 50% larger.
  • the medium exerts a certain pressure on the measuring tube. This medium pressure is particularly intense in the region of the constriction, ie in the middle segment 10. Especially with measuring tubes made of plastic is a cross-sectional widening often already off
  • the measuring tube has a tube holder, which in the specific case is a plate-pin construction.
  • a tube holder which in the specific case is a plate-pin construction.
  • other design options are conceivable depending on the tube shape.
  • the cross-sectional constriction is shown only schematically in FIGS. 1-4. It can be e.g. It also act at the cross-sectional constriction to a rectangular cross-section.
  • a corresponding production of the measuring tube can be done by forming as follows:
  • a punch is inserted into a plastic tube with a continuous circular cross section along the measuring tube axis. This has the outer contour, which should take the lumen of the measuring tube in the reshaped middle segment.
  • the stamp may e.g. consist of two halves, which are in the middle
  • the tube is now pressed. This is preferably done by exposure to heat, e.g. at temperatures above 100 ° C.
  • flat surfaces 13 and 14 can be formed.
  • the surface normals of the two planes are preferably
  • This stiffening layer is preferably formed only in the region in which the flat surfaces extend.
  • the stiffening layer can comprise in FIG. 1 -3 two parallel plates 7 arranged parallel to one another. These flat plates 7 are preferably formed of a solid metal, in particular steel. There may also be several alternatives
  • stacked metal sheets e.g. Be steel sheets.
  • the flat plates are in Fig. 1 -3 on the flat surfaces 13 and 14 of the
  • Plastic tube 2 on. They are connected by bolts 5.
  • the bolts 5 and the flat plates 7 are non-positively connected to the wall of the plastic tube. For example, they can rest directly on the plastic tube. However, it is also possible for further intermediate layers to be arranged between the plastic tube 2 and the plates 7.
  • the stiffening layer is preferably exclusively in the region 10, in which the flat surfaces 13 and 14 extend, arranged.
  • the above-described measuring tube 2 can then be in a magnetic-inductive
  • Measuring device can be used. This is shown in FIG. 4.
  • a magnet system On each stiffening plate 7, a magnet system is arranged.
  • This magnetic system comprises in Fig. 4, two magnetic coils which are diametrically opposed to the flat plates 7 rest.
  • the magnet system generates a magnetic field.
  • the corresponding measuring tube fulfills the requirements for diffusion measurement, mechanical strength and electrical insulation necessary for the measuring principle, so that the finished measuring tube has no disadvantages compared to other standard measuring tubes for magnetic-inductive flowmeters.
  • Fig. 5 shows a more detailed structure of the magnetic-inductive

Abstract

L'invention concerne un débitmètre électromagnétique (1) comprenant un tube de mesure (2) sur lequel sont disposés et/ou fixés un système magnétique et deux électrodes de mesure (3) ou davantage, le tube de mesure (2) présentant une zone d'entrée et une zone de sortie (11, 12) ayant une première section transversale et ledit tube de mesure (2) présentant un segment central (10) situé entre la zone d'entrée et la zone de sortie (11, 12), qui présente une deuxième section transversale, les électrodes de mesure (3) étant montées dans le segment central (10) du tube de mesure (2), ledit segment central (10) étant entouré au moins dans la zone des électrodes de mesure (3) par un support pour tube (15) qui contrecarre une déformation de la deuxième section transversale.
EP15804146.7A 2014-12-22 2015-12-03 Débitmètre électromagnétique Active EP3237848B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014119451.9A DE102014119451A1 (de) 2014-12-22 2014-12-22 Magnetisch-induktives Durchflussmessgerät
PCT/EP2015/078535 WO2016102168A1 (fr) 2014-12-22 2015-12-03 Débitmètre électromagnétique

Publications (2)

Publication Number Publication Date
EP3237848A1 true EP3237848A1 (fr) 2017-11-01
EP3237848B1 EP3237848B1 (fr) 2020-05-06

Family

ID=54771130

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15804146.7A Active EP3237848B1 (fr) 2014-12-22 2015-12-03 Débitmètre électromagnétique

Country Status (5)

Country Link
US (1) US10429220B2 (fr)
EP (1) EP3237848B1 (fr)
CN (1) CN107110678B (fr)
DE (1) DE102014119451A1 (fr)
WO (1) WO2016102168A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017130717A1 (de) 2017-12-20 2019-06-27 Endress+Hauser Flowtec Ag Fertigungsverfahren zur Herstellung eines magnetisch-induktiven Durchflussmessgerätes und magnetisch-induktives Durchflussmessgerät

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DE102014119451A1 (de) 2014-12-22 2016-06-23 Endress+Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät
DE102016112742A1 (de) * 2016-07-12 2018-01-18 Endress+Hauser Flowtec Ag Verfahren zum Messen der Durchflussgeschwindigkeit oder des Volumendurchflusses eines Mediums mittels eines magnetisch-induktiven Durchflussmessgeräts und ein magnetisch-induktives Durchflussmessgerät
DE102017110736A1 (de) * 2017-05-17 2018-11-22 Bürkert SAS Messeinrichtung
DE102017131269A1 (de) * 2017-12-22 2019-06-27 Endress+Hauser Flowtec Ag Verfahren und Vorrichtung zur Milchfettmessung
CN108469282A (zh) * 2018-03-02 2018-08-31 杭州云谷科技股份有限公司 一种高精度低功耗电磁式流量传感装置
DE102018112897A1 (de) 2018-05-30 2019-12-05 Krohne Messtechnik Gmbh Magnetisch-induktives Durchflussmessgerät und Messrohr
CN108801374A (zh) * 2018-06-01 2018-11-13 重庆川仪自动化股份有限公司 一种提高电磁流量性能的流道结构
DE102018114180A1 (de) 2018-06-13 2019-12-19 Endress + Hauser Flowtec Ag Durchflussmessgerät, insbesondere magnetisch-induktives Durchflussmessgerät
DE102018132935A1 (de) * 2018-12-19 2020-06-25 Endress+Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät und Messstelle
CN109883576A (zh) * 2019-03-18 2019-06-14 杭州源牌科技股份有限公司 一种电磁热量表流量传感器装置
DE102020133612A1 (de) 2020-12-15 2022-06-15 Endress + Hauser Flowtec Ag Messgerät und Verfahren zum Bestimmen einer Abrasion

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DE102017130717A1 (de) 2017-12-20 2019-06-27 Endress+Hauser Flowtec Ag Fertigungsverfahren zur Herstellung eines magnetisch-induktiven Durchflussmessgerätes und magnetisch-induktives Durchflussmessgerät

Also Published As

Publication number Publication date
CN107110678A (zh) 2017-08-29
WO2016102168A1 (fr) 2016-06-30
DE102014119451A1 (de) 2016-06-23
EP3237848B1 (fr) 2020-05-06
CN107110678B (zh) 2020-09-15
US10429220B2 (en) 2019-10-01
US20180017419A1 (en) 2018-01-18

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